Currently the United States is the world's largest energy consumer in the world, and for that reason is also the largest source of global warming pollution. The U.S. emits more carbon dioxide than China, India and Japan, combined. 25% of the carbon dioxide pollution produced by the U.S. comes from fossil-fuel burning. By switching to more energy efficient appliances and equipment, we can reduce the demand for electricity and cut carbon dioxide pollution from power plants. When it comes to water heating you won't find a better performing or more efficient unit than a Noritz tankless water heater.